using Furion;
using Furion.DataValidation;
using Furion.DependencyInjection;
using Furion.UnifyResult;
using Furion.UnifyResult.Internal;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using System;
using System.Threading.Tasks;

namespace OnvifWebServer.Extensions
{
	/// <summary>
	/// RESTful 风格返回值
	/// </summary>
	[SuppressSniffer, UnifyModel(typeof(RESTfulResult<>))]
	public class RESTfulResultProvider : IUnifyResultProvider
	{
		/// <summary>
		/// 异常返回值
		/// </summary>
		/// <param name="context"></param>
		/// <param name="metadata"></param>
		/// <returns></returns>
		public IActionResult OnException(ExceptionContext context, ExceptionMetadata metadata)
		{
			return new JsonResult(RESTfulResult(metadata.StatusCode, errors: metadata.Errors));
		}

		/// <summary>
		/// 成功返回值
		/// </summary>
		/// <param name="context"></param>
		/// <param name="data"></param>
		/// <returns></returns>
		public IActionResult OnSucceeded(ActionExecutedContext context, object data)
		{
			return new JsonResult(RESTfulResult(StatusCodes.Status200OK, true, data));
		}

		/// <summary>
		/// 验证失败返回值
		/// </summary>
		/// <param name="context"></param>
		/// <param name="metadata"></param>
		/// <returns></returns>
		public IActionResult OnValidateFailed(ActionExecutingContext context, ValidationMetadata metadata)
		{
			return new JsonResult(RESTfulResult(StatusCodes.Status400BadRequest, errors: metadata.ValidationResult));
		}

		/// <summary>
		/// 特定状态码返回值
		/// </summary>
		/// <param name="context"></param>
		/// <param name="statusCode"></param>
		/// <param name="unifyResultSettings"></param>
		/// <returns></returns>
		public async Task OnResponseStatusCodes(HttpContext context, int statusCode, UnifyResultSettingsOptions unifyResultSettings)
		{
			// 设置响应状态码
			UnifyContext.SetResponseStatusCodes(context, statusCode, unifyResultSettings);

			switch (statusCode)
			{
				// 处理 401 状态码
				case StatusCodes.Status401Unauthorized:
					await context.Response.WriteAsJsonAsync(RESTfulResult(statusCode, errors: "401 Unauthorized")
						, App.GetOptions<JsonOptions>()?.JsonSerializerOptions);
					break;
				// 处理 403 状态码
				case StatusCodes.Status403Forbidden:
					await context.Response.WriteAsJsonAsync(RESTfulResult(statusCode, errors: "403 Forbidden")
						, App.GetOptions<JsonOptions>()?.JsonSerializerOptions);
					break;

				default: break;
			}
		}

		/// <summary>
		/// 返回 RESTful 风格结果集
		/// </summary>
		/// <param name="statusCode"></param>
		/// <param name="succeeded"></param>
		/// <param name="data"></param>
		/// <param name="errors"></param>
		/// <returns></returns>
		private static RESTfulResult<object> RESTfulResult(int statusCode, bool succeeded = default, object data = default, object errors = default)
		{
			return new RESTfulResult<object>
			{
				StatusCode = statusCode,
				Succeeded = succeeded,
				Data = data,
				Errors = errors,
				Extras = UnifyContext.Take(),
				Timestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds()
			};
		}
	}
}